Change the Makefile in cddl/lib/drti to use bsd.lib.mk instead of

bsd.prog.mk -- we need to compile PIC, which requires a library build.
With this change, USDT (userspace DTrace probes) work from within
shared libraries.

PR:		kern/159046
Submitted by:	Alex Samorukov <samm at os2.kiev.ua>
Comments by:	Scott Lystig Fritchie <slfritchie at snookles.com>
MFC after:	3 days

cddl/lib/drti/Makefile

@@ -18,4 +18,4 @@ CFLAGS+=	-I${.CURDIR}/../../../sys/cddl/compat/opensolaris \
 		-I${OPENSOLARIS_SYS_DISTDIR}/uts/common \
 		-DPIC ${PICFLAG}
 
-.include <bsd.prog.mk>
+.include <bsd.lib.mk>